package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * Created by 沐风 on 2024/4/8 17:22
 */
@Component
@Aspect//声明该类是切面类
@Slf4j
public class AutoFileAspect {

    /**
     * 抽取切入点表达式
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void AutoFileJointPoint(){}

    /**
     * 切面
     */
    @Before("AutoFileJointPoint()")//前置通知
    public void AutoFile(JoinPoint joinPoint){
        log.info("公共字段自动填充...");
        //获取当前目标方法上的注解的属性
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获得方法签名
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方面上的注解
        OperationType operationType = autoFill.value();//获得注解的属性

        //获取当前目标方法的参数-实体对象（约定第一个参数）
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        Object entity = args[0];

        //准备数据
        LocalDateTime localDateTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据注解的属性确定是什么操作，填充对应的公共字段属性
        if (operationType == OperationType.INSERT){
            //反射赋值
            try {
                //获取对象的方法
                Method setCreateTime = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateTime = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                //调用方法赋值
                setCreateTime.invoke(entity,localDateTime);
                setUpdateTime.invoke(entity,localDateTime);
                setCreateUser.invoke(entity,currentId);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                setUpdateTime.invoke(entity,localDateTime);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
